화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korea-Australia Rheology Journal, Vol.26, No.3, 319-326, August, 2014
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New way to characterize the percolation threshold of polyethylene and carbon nanotube polymer composites using Fourier transform (FT) rheology
Deepak Ahirwal1, 2, Humberto Palza3, Guy Schlatter2, and Manfred Wilhelm1, †
  • 1Institute of Chemical Technology and Polymerchemistry, Karlsruhe Institute of Technology (KIT), Engesserstr. 18, 76131 Karlsruhe, Germany
  • 2Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Sant, ICPEES-UMR7515, Universit de Strasbourg, CNRS, Institut Carnot MICA, Ecole Européenne de Chimie, Polymères et Matériaux, 25 rue Becquerel, 67087 Strasbourg, cedex 2, France
  • 3Departamento de Ingenieria Quimica y Biotecnologia, Facultad de Ciencias Fisicas y Matematicas, Universidad de Chile, Beauchef 861, Casilla 277, Santiago, Chile
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In this article, a new way to characterize the percolation threshold of polymer nanocomposites made of polyethylene (PE) with single and multi walled carbon nanotubes (SWCNTs and MWCNTs) is presented. Small and large oscillatory shear (SAOS and LAOS) experiments were performed to characterize the degree of dispersion and percolation threshold. The analysis of the stress response in the LAOS regime as a function of the applied deformation amplitude and frequency was performed using Fourier Transform (FT)-Rheology. The zero strain intrinsic nonlinear parameter, Q0(ω), was calculated by extrapolation of I3/1(γ0, ω) and was, used to quantify the nonlinearity measured by FT-Rheology. Interestingly, a drop in Q0 as a function of the CNT weight fraction at a fixed frequency was found that was below the percolation threshold. This was followed by, a steep rise in Q0 above the percolation threshold. Therefore, the new method based on this observation that is proposed and described with this article has the potential to lead to a better understanding of structure-property relationships in polymer nanocomposites.
Keywords:FT-Rheology;nanocomposites;carbon nanotubes;percolation threshold;LAOS
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